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sanitize audit_mq_notify()

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* don't copy_from_user() twice
* don't bother with allocations
* don't duplicate parts of audit_dummy_context()
* make it return void

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2008-12-10 07:16:12 -05:00
parent 7392906ea9
commit 20114f71b2
3 changed files with 27 additions and 52 deletions
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9
include/linux/audit.h
View file

@ -453,7 +453,7 @@ extern int audit_set_macxattr(const char *name);
extern int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr);
extern int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec __user *u_abs_timeout);
extern int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, unsigned int __user *u_msg_prio, const struct timespec __user *u_abs_timeout);
extern int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification);
extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
const struct cred *new,
@ -494,11 +494,10 @@ static inline int audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, unsigned in
return __audit_mq_timedreceive(mqdes, msg_len, u_msg_prio, u_abs_timeout);
return 0;
}
static inline int audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification)
static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
{
if (unlikely(!audit_dummy_context()))
return __audit_mq_notify(mqdes, u_notification);
return 0;
__audit_mq_notify(mqdes, notification);
}
static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
{
@ -553,7 +552,7 @@ extern int audit_signals;
#define audit_mq_open(o,m,a) ({ 0; })
#define audit_mq_timedsend(d,l,p,t) ({ 0; })
#define audit_mq_timedreceive(d,l,p,t) ({ 0; })
#define audit_mq_notify(d,n) ({ 0; })
#define audit_mq_notify(d,n) ((void)0)
#define audit_mq_getsetattr(d,s) ((void)0)
#define audit_log_bprm_fcaps(b, ncr, ocr) ({ 0; })
#define audit_log_capset(pid, ncr, ocr) ({ 0; })

14
ipc/mqueue.c
View file

@ -1003,17 +1003,17 @@ asmlinkage long sys_mq_notify(mqd_t mqdes,
struct mqueue_inode_info *info;
struct sk_buff *nc;
ret = audit_mq_notify(mqdes, u_notification);
if (ret != 0)
return ret;
if (u_notification) {
if (copy_from_user(&notification, u_notification,
sizeof(struct sigevent)))
return -EFAULT;
}
audit_mq_notify(mqdes, u_notification ? &notification : NULL);
nc = NULL;
sock = NULL;
if (u_notification != NULL) {
if (copy_from_user(&notification, u_notification,
sizeof(struct sigevent)))
return -EFAULT;
if (unlikely(notification.sigev_notify != SIGEV_NONE &&
notification.sigev_notify != SIGEV_SIGNAL &&
notification.sigev_notify != SIGEV_THREAD))

56
kernel/auditsc.c
View file

@ -139,12 +139,6 @@ struct audit_aux_data_mq_sendrecv {
struct timespec abs_timeout;
};
struct audit_aux_data_mq_notify {
struct audit_aux_data d;
mqd_t mqdes;
struct sigevent notification;
};
struct audit_aux_data_execve {
struct audit_aux_data d;
int argc;
@ -246,6 +240,10 @@ struct audit_context {
mqd_t mqdes;
struct mq_attr mqstat;
} mq_getsetattr;
struct {
mqd_t mqdes;
int sigev_signo;
} mq_notify;
};
#if AUDIT_DEBUG
@ -1267,6 +1265,11 @@ static void show_special(struct audit_context *context, int *call_panic)
return;
}
break; }
case AUDIT_MQ_NOTIFY: {
audit_log_format(ab, "mqdes=%d sigev_signo=%d",
context->mq_notify.mqdes,
context->mq_notify.sigev_signo);
break; }
case AUDIT_MQ_GETSETATTR: {
struct mq_attr *attr = &context->mq_getsetattr.mqstat;
audit_log_format(ab,
@ -1376,14 +1379,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec);
break; }
case AUDIT_MQ_NOTIFY: {
struct audit_aux_data_mq_notify *axi = (void *)aux;
audit_log_format(ab,
"mqdes=%d sigev_signo=%d",
axi->mqdes,
axi->notification.sigev_signo);
break; }
case AUDIT_EXECVE: {
struct audit_aux_data_execve *axi = (void *)aux;
audit_log_execve_info(context, &ab, axi);
@ -2274,38 +2269,19 @@ int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len,
* @mqdes: MQ descriptor
* @u_notification: Notification event
*
* Returns 0 for success or NULL context or < 0 on error.
*/
int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification)
void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
{
struct audit_aux_data_mq_notify *ax;
struct audit_context *context = current->audit_context;
if (!audit_enabled)
return 0;
if (notification)
context->mq_notify.sigev_signo = notification->sigev_signo;
else
context->mq_notify.sigev_signo = 0;
if (likely(!context))
return 0;
ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
if (!ax)
return -ENOMEM;
if (u_notification != NULL) {
if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) {
kfree(ax);
return -EFAULT;
}
} else
memset(&ax->notification, 0, sizeof(ax->notification));
ax->mqdes = mqdes;
ax->d.type = AUDIT_MQ_NOTIFY;
ax->d.next = context->aux;
context->aux = (void *)ax;
return 0;
context->mq_notify.mqdes = mqdes;
context->type = AUDIT_MQ_NOTIFY;
}
/**